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GPU-Z readings mismatch

Discussion in 'GPU-Z' started by jasonx, Nov 8, 2012.

  1. jasonx New Member

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    GPU-Z shows 2 different pixel Fill Rates, between 2 different versions.

    from 0.5.7 to 0.6.6 - 10.1 GPixles/s
    0.5.6- 23 GPixles/s

    which one is correct

    [​IMG][​IMG]
  2. W1zzard

    W1zzard Administrator Staff Member

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  3. temp02 New Member

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    That or this juicy first post.

    And yes, the second screen-shot (most recent version of GPU-Z) is the correct one.
  4. T4C Fantasy

    T4C Fantasy CPU & GPU DB Maintainer

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  5. jasonx New Member

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    thanx for the answer and the trolling at the same time, i did search maybe i missed the correct search query or look in the wrong sub forum, but anyways thanx
  6. 95Viper

    95Viper

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    Welcome to TPU, jasonx!

    W1zzard gets to troll or anything W1zzard wants to do... it is his site.

    However, there are a lot of other Trolls here and you can hit the little triangle, with the exclamation in it, to report them or any violation... the mods here will respond and are very fair.

    Again, Welcome, and feel free to contribute.:)
  7. W1zzard

    W1zzard Administrator Staff Member

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    I must have answered that question like 20 times and keep wondering why people can't find it. no offense, welcome to the forums
    95Viper says thanks.
  8. Maban

    Maban

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    Perhaps add something about it in the fillrate tooltip only for Fermi? Though I'm sure it would go unnoticed by most.
    95Viper says thanks.
  9. Flickspeed New Member

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    Pixel Fillrate Calculation

    Hey are you sure you are using the correct way to calculate pixel fillrate in the current versions? I read the other threads and see some inconsistencies.

    It seems the pixel fillrate is still not calculated properly for Fermi Cards. Are you taking into account the following information?

    Each Streaming Multiprocessor(SM) in the GPU of GF100 architecture contains 32 SPs and 4 SFUs.
    Each Streaming Multiprocessor(SM) in the GPU of GF104/106/108 architecture contains 48 SPs and 8 SFUs.
    Each Streaming Multiprocessor(SM) in the GPU of GF110 architecture contains 32 SPs and 4 SFUs.
    Each Streaming Multiprocessor(SM) in the GPU of GF114/116/118/119 architecture contains 48 SPs and 8 SFUs.

    Each SP can fulfill up to two single precision operations FMA per clock. Each SFU can fulfill up to four operations SF per clock. The approximate ratio of operations FMA to operations SF is equal: for GF100 4:1 and for GF104/106/108 3:1. The theoretical shader performance in single-precision floating point operations(FMA) [FLOPSsp, GFLOPS] of the graphics card with shader count [n] and shader frequency [f, GHz], is estimated by the following: FLOPSsp ≈ f × n × 2. Alternative formula: for GF100 FLOPSsp ≈ f × m × (32 SPs × 2(FMA)) and for GF104/106/108 FLOPSsp ≈ f × m × (48 SPs × 2(FMA)). [m] - SM count. Total Processing Power: for GF100 FLOPSsp ≈ f × m ×(32 SPs × 2(FMA) + 4 × 4 SFUs) and for GF104/106/108 FLOPSsp ≈ f × m × (48 SPs × 2(FMA) + 4 × 8 SFUs) or for GF100 FLOPSsp ≈ f × n × 2.5 and for GF104/106/108 FLOPSsp ≈ f × n × 8 / 3.[16] where:
    SP - Shader Processor (Unified Shader, CUDA Core), SFU - Special Function Unit, SM - Streaming Multiprocessor, FMA - Fused MUL+ADD.

    Based on this information the current calculation method is wrong!
    Last edited: Jan 2, 2013
  10. T4C Fantasy

    T4C Fantasy CPU & GPU DB Maintainer

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    check out the gpu database, it uses the latest known calculation for Fermi
    http://www.techpowerup.com/gpudb/265/NVIDIA_GeForce_GTX_460.html
  11. Flickspeed New Member

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  12. Maban

    Maban

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    What the hell are you going on about? This thread is about pixel fill rate not shader count. You are obviously trying to figure floating point performance. That is entirely out of the scope of this thread.
  13. Flickspeed New Member

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    Maban you can disregard anything after the last sentence in red.

    I am just making corrections to the following post which wizzard made a base for calculations. It has a fundental error.

    It is not the SM that is limiting anything :):) Thats the fundamental error I marked it in red ;) So at the end of the day, it is still ROPs times MHz. Prove me wrong and give me the source saying an SM can only process 2 Pixels per clock.
    Last edited: Jan 2, 2013
  14. Maban

    Maban

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    Read the white papers.
  15. Flickspeed New Member

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    Show me where is says an SM is limited to two pixels per clock in the white papers. Links please.....

    I don't work for nvidia and I am not an nvidia fan boy, I am just not liking the fact of misreporting theoretical pixel fillrate values without any valid proof. The start would be to prove that an SM can only do 2 pixels per clock, I couldn't find this anywhere on www except in some post here :)

    Maban instead of posting useless comments you can start here: http://www.nvidia.com/content/PDF/fermi_white_papers/NVIDIAFermiComputeArchitectureWhitepaper.pdf :) good luck and have fun.

    Also if there is no proof I would like to ask w1zzard to make GPU-Z calculate Theoretical Pixel Fillrates based on the old formula.
    Last edited: Jan 2, 2013

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